Web3Tools/demo/web3_demo.py

# -*- coding: utf-8 -*-
from web3 import Web3, HTTPProvider

# 连接到以太坊节点
w3 = Web3(HTTPProvider('http://127.0.0.1:8545'))

# 检查是否连接成功
if w3.isConnected():
    print("Connected to Ethereum node")
else:
    print("Failed to connect to Ethereum node")
    exit()

# 1. 获取最新区块号
latest_block = w3.eth.block_number
print(f"Latest block number: {latest_block}")

# 2. 获取区块信息
block = w3.eth.get_block(latest_block)
print(f"Block info: {block}")

# 3. 获取账户余额
account = '0xYourAccountAddress'  # 替换为你的账户地址
balance = w3.eth.get_balance(account)
print(f"Balance of {account}: {w3.fromWei(balance, 'ether')} ETH")

# 4. 发送交易
sender = '0xYourAccountAddress'  # 替换为你的账户地址
private_key = 'YourPrivateKey'  # 替换为你的私钥
receiver = '0xReceiverAddress'  # 替换为接收方地址

nonce = w3.eth.get_transaction_count(sender)
tx = {
    'nonce': nonce,
    'to': receiver,
    'value': w3.toWei(0.01, 'ether'),
    'gas': 2000000,
    'gasPrice': w3.toWei('50', 'gwei'),
}
signed_tx = w3.eth.account.sign_transaction(tx, private_key)
tx_hash = w3.eth.send_raw_transaction(signed_tx.rawTransaction)
print(f"Transaction hash: {w3.toHex(tx_hash)}")

# 5. 与智能合约交互
contract_address = '0xYourContractAddress'  # 替换为合约地址
contract_abi = [...]  # 替换为合约的ABI
contract = w3.eth.contract(address=contract_address, abi=contract_abi)

# 调用合约的只读方法
result = contract.functions.yourReadOnlyMethod().call()
print(f"Result from contract: {result}")

# 调用合约的写方法
tx = contract.functions.yourWriteMethod(param1, param2).buildTransaction({
    'nonce': w3.eth.get_transaction_count(sender),
    'gas': 2000000,
    'gasPrice': w3.toWei('50', 'gwei'),
})
signed_tx = w3.eth.account.sign_transaction(tx, private_key)
tx_hash = w3.eth.send_raw_transaction(signed_tx.rawTransaction)
print(f"Transaction hash: {w3.toHex(tx_hash)}")

# 6. 监听事件
event_filter = contract.events.YourEvent.createFilter(fromBlock='latest')
print("Listening for events...")
while True:
    for event in event_filter.get_new_entries():
        print(f"New event: {event}")

# 7. 获取交易收据
tx_receipt = w3.eth.get_transaction_receipt(tx_hash)
print(f"Transaction receipt: {tx_receipt}")

# 8. 获取交易详情
tx_detail = w3.eth.get_transaction(tx_hash)
print(f"Transaction detail: {tx_detail}")

# 9. 获取日志
logs = w3.eth.get_logs({
    'fromBlock': 0,
    'toBlock': 'latest',
    'address': contract_address,
})
print(f"Logs: {logs}")

# 10. 获取当前 Gas 价格
gas_price = w3.eth.gas_price
print(f"Current gas price: {w3.fromWei(gas_price, 'gwei')} gwei")

# 11. 获取账户交易数量
transaction_count = w3.eth.get_transaction_count(sender)
print(f"Transaction count: {transaction_count}")

# 12. 获取合约代码
contract_code = w3.eth.get_code(contract_address)
print(f"Contract code: {contract_code}")

# 13. 获取账户存储
storage = w3.eth.get_storage_at(contract_address, 0)
print(f"Storage at position 0: {storage}")

# 14. 获取账户 nonce
nonce = w3.eth.get_transaction_count(sender)
print(f"Account nonce: {nonce}")

# 15. 获取区块 gas 限制
gas_limit = w3.eth.get_block('latest')['gasLimit']
print(f"Gas limit: {gas_limit}")

# 16. 获取区块 gas 使用量
gas_used = w3.eth.get_block('latest')['gasUsed']
print(f"Gas used: {gas_used}")

# 17. 获取区块 gas 费用
gas_fee = gas_used * gas_price
print(f"Gas fee: {w3.fromWei(gas_fee, 'ether')} ETH")